C. elegans EGL-9 and mammalian homologs define a family of dioxygenases that regulate HIF by prolyl hydroxylation. by Epstein, A, Gleadle, J, McNeill, L, Hewitson, K, O'Rourke, J, Mole, D, Mukherji, M, Metzen, E, Wilson, M, Dhanda, A, Tian, Y, Masson, N, Hamilton, D, Jaakkola, P, Barstead, R, Hodgkin, J, Maxwell, P, Pugh, C, Schofield, C, Ratcliffe, P